Digg – Lets you know if the page you are viewing has been dugg, how many it has received, recent comments and more.

DownThemAll – A popular extension that assists you in downloading multiple files from a page with just a few clicks.

Facebook Toolbar – Gives you notifications of new mail and pokes on your Facebook account.

Firebug – A mainstay of the developer community, Firebug strips down Web pages quickly and lets you work on JAVA, HTML, CSS and more, directly inside the browser.

FireGestures – Use five different mouse gestures to control various functions of Firefox.

Flagfox – See a flag in the status bar that tells you what country the server is in for the website you are on. You can then look up more detailed information on the server, giving you some extra security in case the site is a fake.

FlashBlock – Annoyed with Flash animations that play on sites when you launch them? FlashBlock will stop them from playing.

Foxmarks – Have more than one computer? Then you have to have Foxmarks. It synchronizes your bookmarks across multiple computers and gives you access to them via their website.

FoxyTunes – Gives you control over multiple media players directly from your browsers to save you the effort of changing windows.

Forecastfox – Weather forecasts brought to you by the people at AccuWeather.com.

Google Toolbar – Gives you the ability to search Google from a toolbar, access to your mail, auto fill forms and several other features.

Greasemonkey – Greasemonkey is the necessary extension to run the ceaseless stream of Greasmonkey scripts that allow you to customize sites from Facebook to Gmail.

GSpace – Gmail gives you nearly 7 GB of free storage. With Gspace, you can turn some or all of that into free online storage of files that you can access from anywhere.

IETab – Sometimes you just have to look at some things in Internet Explorer due to coding issues. Well, using a tab inside of Firefox is a far sight better than having to open up IE itself.

MeasureIt – An extension perfect for designers that allows you to measure the dimensions of any section of a page to figure out how much real-estate it is occupying.

Meebo – Gives you a sidebar with all of your buddies from the various instant messenger services that Meebo supports such as AIM and MSN.

NoScript – An important extension in your security arsenal as it prevents scripts from running in the background of a website without your express permission.

QuickRestart – One of the most annoying things about adding a new extenstion to Firefox is the down time while it restarts the browser to work properly. This extension speeds up the process.

Reload Every – Allows you to set your tabs to reload every few seconds or minutes, handy for sites likeTwitter.

Sage-Too – A lightweight RSS reader you can integrate into your browser.

StumbleUpon Toolbar – Allows you to stumble pages from a convenient toolbar, add comments, view what has been said and more.

Update Notifier – You’ve been adding all these extensions, but it’s easy to forget to check to see when they’ve been updated. This puts the notifications out front where it’s easy to keep track of them.

Video DownloadHelper – Assists you in finding and downloading videos from over 500 websites all over the world.

WebMail Notifier – Get notifications of new email in your status bar for services such as Hotmail, Gmail, Yahoo Mail and more.

Each Top 10 entrant is linked to the page where Firefox users can install them from. See if you can't find something new for your browsing routine below.

We like it because we're bloggers, having to quote and copy links and code every day, but anyone who does a fair amount of copying to and from the web will dig AutoCopy. The basic use: It copies anyt text you select on the web as soon as you select it—no Ctrl+C necessary. For pasting into text forms, you simply hit the middle mouse button rather than Control+V. If that's all it did, hey, we'd recommend it to anyone who writes, copies, or pastes a lot, but we also have to point out that it fixes really long, wrap-broken URLs automatically. Three cheers for fewer pinky-finger stretches!

It's a bit more technical than most browser extensions, but for all intents and purposes, Gears is an easy-to-install add-on that unlocks an entirely new world to the internet. Primarily, it takes Google apps offline—Gmail, Google Reader, Docs, and Calendar—but a handful of other apps make good use of its mini-database powers, including Remember the Milk and PassPack. Still, given the kind of impressive implementation Offline Gmail received, we've only scratched the surface of the potential in them there gears.

Personal Menu is kind of a next-generation version of themuch-loved Tiny Menu, accomplishing the same basic but totally great effect: Giving the web content you're actually looking at more space to breath. It does this by stripping the screen-wide menu bar at the top of Firefox's windows and converting it into a single drop-down menu, then lets you choose which of those menus show up in it. Keyboard shortcut ninjas can enable an option to temporarily bring back the menu bar when Alt is pressed, and the extension auto-adds a history and bookmarks button to the main toolbar to compensate for the two most active menus.

It's not a revelation that Gmail functionality is one of our pet obsessions. Better Gmail 2 fixes or answers a lot of our Gmail complaints and wishes in one neat package. You can individually enable or kill any of Better Gmail's more than a dozen fixes and improvements, and whenever a great new Gmail user script hits the Greasemonkey realm, you can count on seeing it added to Better Gmail by our own Gina Trapani.

Not a tool you need every day, but really useful when you want it, DownThemAll is a selective, powerful download manager. It makes short work of snatching all the images on a page (including those links to the "bigger" or "zoom" versions), all the MP3s off a music blog, or any other kind of filter you can set up. Gina's showed us how to do some smart tune-grabbing and Flickr downloading with her guide to supercharging your Firefox downloads with DownThemAll, but her walkthrough should work for any types of files and any page. Incidentally, DownThemAll isn't just one of our favorites—it's also the most popular download manager among Lifehacker readers.

Remember browsing before tabs? We kind of recall a faint smell of kerosene and words like "dubloon" still in use. In all seriousness, browser tabs are the key ingredient to how many of us multi-task on the web every day, and Tab Mix Plus is a master key for everything you like or loathe about tabs. It controls which links open in a new tab, new window, or same window to an OCD-friendly level, adds key features like italicizing the text on tabs you haven't viewed yet, and super-powers Firefox's undo closed tab feature. It gets way, way more intricate than that, but even for just the bare basics, it's totally worth the install.

This one is technically an experimental, non-Mozilla-approved download, but with the positive reaction it received in our experimental extensions round-up, and experimental extensions no longer requiring a sign-up and log-in, it's more than worth stepping out on the ledge. It's the smart-downloading companion to DownThemAll, placing the files you download in a certain folder on your system based on the file extension or the site you grab it from. So if you always want the .xls spreadsheets you grab from Gmail to go into your Reports folder, but an .xls you grab from anywhere else to show up on your Desktop like everything else, you set the rules. JPG files from your friends' Flickr page, versus photo downloads off the rest of the net? Tell them where they should go. It keeps your folders and desktop clean, and sets up rules you shouldn't have to tweak much after one go—truly an extension after our own geeky hearts.

You knew this would be here, didn't you? Ad-blocking can make the internet a more tolerable place to look around, and AdBlock Plus does this with a powerful ad-blocking feed subscription you can pick at start-up. Alternately, any ads you find particularly distracting ("ONE RULE TO A FLAT STOMACH: OBEY") can be right-clicked on and killed in perpetuity with "Adblock Image." Ads can be brought back if you're feeling curious, but as many a commenter (and AdBlock-loving editor) has said: After getting used to AdBlock Plus, you forget what the internet truly looks like until you turn this extension off. Lifehacker is, of course, an advertising-supported site, so we'd love it if you kept our ads displaying, opting instead to individually kill only the ones that make your eyeballs itch.

For Firefox changes that require deep browser integration (like adding a new button to the browser's chrome), there are extensions. For everything else, there's Greasemonkey. Greasemonkey is a difficult extension for the uninitiated to wrap their heads around, but once they do, it's a breeze. In essence, Greasemonkey is a meta-extension of sorts. It does nothing by default when first installed; the power lies in Greasemonkey user scripts developed by JavaScript-wielding geeks fed up with under-performing sites or interested in bringing more power to the sites they already love. If you don't like seeing labels on your Gmail messages, but wouldn't mind seeing them when your pointer hovers over them, there's a fix. Want YouTube to acknowledge your bandwidth and load high-quality clips by default? Same deal. Those are just a few recent examples, but the list goes on, and the fixes keep getting better. You can find Greasemonkey scripts all over the web, but if you're just getting started, you may also want to check out Userscripts.org—sort of like Mozilla's add-ons site but for Greasemonkey scripts.

Foxmarks is gradually rebranding as Xmarks, but what we really like about Fox/Xmarks remains the same as the last time it claimed the Must-Have crown: It's nearly seamless at keeping your bookmarks and passwords synchronized between browsers on any platform, and stores them on a site you can visit from any browser where you can't install an extension. If you're not down with the cloud, you can even tell this extension to store your stuff on your own server. Foxmarks is also available on IE and Safari, and you can separate your work bookmarking from ooh-cool life stuff with selective bookmark profiles. It's the tool that lets you keep fleeting thoughts, IM links, and other ephemeral web stuff all together, so of course we dig on it. The transition to Xmarks adds a few semi-nifty, social-y features to your searching and bookmarking, but if you're not keen on those changes, you can easily disable them in the Xmarks preferences.

10 Addons Must Have Of Firefox for Web Designers

Among all web browser firefox is the very popular and user friendly browser.Because it is flexible and much and more quality compare to another browser.Among web designers, the Firefox browser is popular because of user-friendly interface and its various features. Add-ons make Firefox especially valuable to web designers. Here is a list of the top 10 must-have add-ons you’ll want to use if you’re a web designer.Thats why it is so much popular.

1. Firebug -This addon will allow you to watch the script of the webpage and also to modify it as u want at the client side.

2. Pixel Perfect – Pixel Perfect is a Firefox/Firebug extension that allows web developers and designers to easily overlay a web composition over top of the developed HTML.

3.Web Developer – With the help of this addon you can add various tools menus toolbars to the various pages and you can also customize each and everything.So this addon will also the web developers for easy and fast web designing.

4. IE Tab – This addons is for them who uses INTERNET EXPLORER.The persons who are using internet explorer this addons is very helpful to them.this addon will show the web content of the page displayed by the IE.You can also make changes and adjustments as you want.

5. FireShot – This addon will take a snapshot of the web page.Here you can add graphical annotations to each and every part of the web content where you want to add that for the reminder.so that if anyonw will see this snapshot can be easily understood by him/her.

(Image Taken From Official Mozilla Website)

6. Palette Grabber – This addon will help those persons who use Photoshop,paint.net and other image editing tools.This ad-don will create the custom color patterns and many more functionality.

7.Firecookie – This is typically the firebug extension.It will manage all the cookies and also let you allow to manage and modify the cookie.

8. GridFox – This addon will help web developers to ovelay or to make or to put the grid on the website.web developers also extract and create grids.

9. YSlow – Based on yahoo performance rules or the policy if any website have some faults or the website is down or the slow.then you can report it here by this ad-don.It will see the survey and contact to the official that website for this problem's solution.

10. Aardvark – Usually web developer clean the pages by removing.For that persons this tool will help them.